"The single most effective thing you can do to maintain your health, especially in your 70s, is exercise," says Dr. Peter Hollmann, who is chairman of the public policy committee for the American Geriatrics Society.

The health overhaul requires that preventive services recommended by the U.S. Preventive Services Task Force be covered for seniors at no charge. But on the subject of exercise, the task force doesn't say much. It doesn't evaluate the preventive value of exercise at all — not surprising since its focus is on services and screenings.

The only statement the task force makes is that there's not enough evidence about the effectiveness of doctors promoting physical activity to recommend for or against it.

Even so, advocates for seniors hope the annual wellness visit will provide a chance to encourage Medicare beneficiaries to get out and about. "If you want to be healthy in your 80s, keep moving in your 70s," says Hollmann. "Even if you've already lost some ground, you can keep from losing more by ramping your program to your capacity."

Shots is the online channel for health stories from the NPR Science Desk. We report on news that can make a difference for your health and show how policy shapes our health choices. Look to Shots for the latest on research and medical treatments, as well as the business side of health. Your hosts are Scott Hensley and Nancy Shute. You can reach the Shots team via our contact form.